| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Markus Wanner <markus(at)bluegap(dot)ch> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>, PostgreSQL-development Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: bg worker: patch 1 of 6 - permanent process |
| Date: | 2010-08-26 21:58:56 |
| Message-ID: | AANLkTin_98H58DNrPfjmo2M=k33ewYfiUAAYTm6yL9R+@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Aug 26, 2010 at 3:40 PM, Markus Wanner <markus(at)bluegap(dot)ch> wrote:
> On 08/26/2010 09:22 PM, Tom Lane wrote:
>>
>> Not having to have a hard limit on the space for unconsumed messages?
>
> Ah, I see. However, spilling to disk is unwanted for the current use cases
> of imessages. Instead the sender needs to be able to deal with
> out-of-(that-specific-part-of-shared)-memory conditions.
Shared memory can be paged out, too, if it's not being used enough to
keep the OS from deciding to evict it. And I/O to a mmap()'d file or
shared memory region can remain in RAM.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
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